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प्रश्न
Answer the following in detail.
Define friction and explain how it is useful to us.
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उत्तर
Friction is a force that opposes relative motion between two bodies/surfaces in contact with each other. Although friction opposes the motion, it also makes motion possible.
Friction helps us do many things like :
- It helps us in walking. In the absence of friction, we may slip or M.
- Cars and buses are able to move safely on roads due to the friction between the treaded tires of these vehicles and the surface of the road.
- Friction allows us to hold objects with our hands.
- It allows us to write on paper.
- Friction produces heat. In winter, when we rub our cold hands, the heat produced due to friction makes our hands warm.
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संबंधित प्रश्न
Write true or false.
The sliding friction is more than the rolling friction.
Select the correct alternative.
Friction is reduced by
Name the two kinds of forces in nature.
Define sliding friction
Define rolling friction
Fill in the blank.
.................... is the SI unit of force.
State if the following statement is true or false. Correct the statement if it is false.
If two forces acting in opposite directions on a body arc of equal magnitude, then the body will not move.
Tick the most appropriate answer.
Force of friction comes into play when a/an
Answer the following in a word or two or in a sentence.
Why is difficult for a pen to leave a mark on a highly smooth plastic sheet?
A moving body comes to rest due to friction alone.
